Thermodynamik des Selendampfes

Rau, Hans

doi:10.1002/bbpc.19670710714

Ber Bunsenges Phys Chem

1967

DOI: 10.1002/bbpc.19670710714

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Thermodynamik des Selendampfes

Hans Rau

Abstract: An Selendämpfen wurde für Temperaturen zwischen 712 und 1147°K und Drucke bis 1500 Torr das mittlere Molekulargewicht bestimmt. Aus den Ergebnissen und Literaturwerten werden Gleichungen abgeleitet, die den Partialdruck von Se2 als Funktion von Druck und Temperatur zu berechnen gestatten. Daneben wurde die Sättigungsdruckkurve des flüssigen Selens etwa zwischen dem Schmelz‐ und dem Siedepunkt gemessen.Aus der Se2‐Partialdruckkurve des gesättigten Selendampfes wurden folgende thermodynamische Daten berechnetDie… Show more

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Cited by 21 publications

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Das Bildungsgleichgewicht des Selenwasserstoffs

Rau

1967

Ber Bunsenges Phys Chem

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Gemische von Pt und Pt5Se4 bzw. SnSe und Sn2Se3 wurden mit Wasserstoff getempert und das sich bildende H2Se/H2‐Gemisch analysiert. An den gleichen Gemischen wurde der Se2‐Koexistenzdruck mit der Mitführungsmethode gemessen. Durch Kombination der Ergebnisse wurde das Bildungsgleichgewicht des H2Se aus den gasförmigen Elementen (H2, Sc2) berechnet. Es ergaben sich die folgenden Daten:magnified image

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Das Bildungsgleichgewicht des Selenwasserstoffs

Rau

1967

Ber Bunsenges Phys Chem

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Density Measurements for Expanded Fluid Selenium up to the Liquid‐vapour Supercritical Region by the X‐Ray Absorption Method

Hosokawa

Kuboi

Tamura

1997

Ber Bunsenges Phys Chem

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Density of expanded fluid selenium was measured in the temperature and pressure ranges up to 1650°C and 700 bar including the liquid‐vapour critical point by the x‐ray absorption method. For the measurements, a new type of cell made of polycrystalline sapphire and a high‐pressure vessel of authors' own design were developed. The critical temperature, pressure and density of 1615 ± 5°C, 385 ± 5bar, 1.85 ± 0.03g cm−3, respectively, were obtained. We found that isochores bend in the semiconductor‐metal transition region. The shape of the isochore seems an elongated inverse‐S letter. The diameter of the liquid‐vapour coexistence curve is deviated from the law of the rectilinear diameter to the liquid side slightly around the SC‐M transition region and strongly near the critical point. A distinct crossover was also found in the critical exponent β; the value of β drastically changes from 0.30 to 0.10 when the critical point is approached.

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Pyrolytic production of Se (³P) from carbon diselenide. I. Equilibrium

Marquart

Belford

Fraenkel

1977

Int J of Chemical Kinetics

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Thermodynamic characteristics of the dissociation of carbon diselenide are examined. Results of a shock-tube study of CSe2 pyrolysis are combined with previously unreported photoionization spectroscopy data on CSez and with a critical examination of the available literature on Se(g), SeZ(g), CSe(g), CSez(g), and CSez(l). Based on the best currently available information, recommendations are made for the values of enthalpies, entropies, heat capacities, and derived functions. In particular, the most likely value for AHo0(CSe2(g) -i CSe(g) 4-Se(g,aP)) is $83 kcal/mol, and for K p a t 2000°K it is 0.018 atm.

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Thermodynamik des Selendampfes

Cited by 21 publications

References 7 publications

Das Bildungsgleichgewicht des Selenwasserstoffs

Das Bildungsgleichgewicht des Selenwasserstoffs

Density Measurements for Expanded Fluid Selenium up to the Liquid‐vapour Supercritical Region by the X‐Ray Absorption Method

Pyrolytic production of Se (³P) from carbon diselenide. I. Equilibrium

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Thermodynamik des Selendampfes

Cited by 21 publications

References 7 publications

Das Bildungsgleichgewicht des Selenwasserstoffs

Das Bildungsgleichgewicht des Selenwasserstoffs

Density Measurements for Expanded Fluid Selenium up to the Liquid‐vapour Supercritical Region by the X‐Ray Absorption Method

Pyrolytic production of Se (3P) from carbon diselenide. I. Equilibrium

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Pyrolytic production of Se (³P) from carbon diselenide. I. Equilibrium